The ISBN code

The ISBN code( International Standard Book Number) serves as an identity label for books all over the world.
Since January 2007, it is composed of 13 digits, split into 5 parts which are separated by hyphens.

ISBN
Éditions Casterman
Les Aventures de Tintin
Vol 714 pour Sydney

The first part 978 means that it is a book.

The second part identifies the country, region or language code.

0 et 1 2 88 90 982
anglophone
countries		 francophone
countries		 italophone
countries		 The Netherlands,
Belgium and Flemish 		South
Pacific

The third part identifies the publisher, and the fourth part refers to the book.

The last digit is a control to make sure the following rule is adhered to :

Example using ISBN 978-2-203-00121-6

Multiply the first digit by 1, the second by 3,
the third by 1, the fourth by 3 etc...
up to the twelfth digit.

9;21;8;6;2;0;3;0;0;3;2;3
Work out the sum, S of these 12 numbers.

S = 9 + 21 + 8 + 6 +2 + 3+ 3 + 2 + 3 = 57

Work out the remainder, R of the division of S by 10. R = 7

If R = 0, the control digit is 0;if not it is the difference between 10 and R.

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